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Finding the Fourth Proportional to 3,919, 5,876.46 and 1,321

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Solution

The fourth proportional to 3,919, 5,876.46 and 1,321 is: 1,980.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,919 : 5,876.46 = 1,321 : x
  2. Step 2: Convert to fraction form
    3,919/5,876.46 = 1,321/x
  3. Step 3: Cross multiply
    3,919x = 5,876.46 × 1,321
  4. Step 4: Simplify right side
    3,919x = 7,762,803.66
  5. Step 5: Solve for x
    x = 7,762,803.66/3,919
  6. Step 6: Final answer
    x = 1,980.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.